Nanoplasmonic for probing gas/particle interactions

Benjamin Demirdjian (1) , Igor Ozerov (1) , F. Bedu (1) , Alain Ranguis (1) , Claude R Henry (1)

1 CINaM - Centre Interdisciplinaire de Nanoscience de Marseille

When gas molecules are adsorbed or interact on Au nanodisks (direct sensing) or on nanoparticles (NPs) supported on Au disks (indirect sensing), they modify the local dielectric properties and cause a wavelength shift of the Au disks localized surface plasmon resonance (LSPR). We measured water adsorption isotherms by following the Au LSPR shift when water molecules adsorb/desorb on Au nanodisks. We were able to detect by direct nanoplasmonic sensing a few hundredths of an adsorbed water monolayer [1]. Then we used indirect nanoplasmonic sensing (INPS) to follow, with a high sensitivity, the interaction of water vapor on soot NPs that are a major contributor to global warming. Lastly, CO and oxygen adsorption as well as CO oxidation, on Pt NPs, have also been studied by INPS [2]. Due to an optimization of the physical parameters of our plasmonic nanosensor, and coupling with mass spectrometry, we obtain a quantitative and a very sensitive probe that can detect gas adsorption of a few hundredths of a monolayer, even with a very low density of NPs. Moreover, we can use nanoplasmonic sensing at any pressure and temperature. References [1]B. Demirdjian, F. Bedu, A. Ranguis, I. Ozerov, C. R. Henry, Langmuir 34, 5381-5385 (2018) [2]B. Demirdjian, I. Ozerov, F. Bedu, A. Ranguis and C. R. Henry, ACS Omega 6, 13398-13405 (2021)

Domaines: Matière Condensée [cond-mat]; Optique [physics.optics]; Micro et nanotechnologies/Microélectronique; Catalyse

Benjamin Demirdjian, Igor Ozerov, F. Bedu, Alain Ranguis, Claude R Henry. Nanoplasmonic for probing gas/particle interactions. Les journées scientifiques communes des GDR Plasmonique active et GDR Photo Electro Stimulation, Jun 2022, Le Mans, France. ⟨hal-03690393⟩